function addToCart(formname)
{
    var form = document.forms[formname];
    qty = form['Qty'].value;
    if (qty == '')
        qty = 1;
    else
    {
        if (isNaN(qty))
            qty = 1;
        else
            qty = parseInt(qty);
    }
    
    for (var i = 0; i < form.elements.length; i++)
    {
        var elem = form.elements[i];
        if (elem.name.match("vwquantity"))
        {
            var elemqty = parseInt(elem.value);
            elem.value = elemqty * qty;
        }
    }
    
    form.submit();
}